Dyestuff preparations for printing



Patented July 10, 1951 2,559,808 H DYESTUFF PREPARATIONS FOR PRINTING Arthur Topham, Blackley, Manchester, England,

assignor t Imperial Chemical Industries Limited, a corporation of Great :Britain No Drawing. Application January 27, 1949581?- rial No. 73,236. In Great-Britain January 26,

8 Claims. H 1 This invention relates to dyestufi preparations and more particularly it relates to dyestufl preparations containing leuco sulphuric ester derivatives of vat dyestuffs for use in the printing of 2 The paste so obtained is printed onto cotton fabric. The fabric is then dried and the print developed by padding the fabric through 2% sulphuric acid solution at 70 C. rinsing in-water textile materials. 5 and soaping at the boil. A very bright, level According to my invention I provide new dyeand strong orange print is obtained.

stuii preparations for use in the printing of In the above example the 2-benzylthioeA textile materials which comprise a leuco sulphuric iminazoline-m-sulphonic acid may be replaced ester derivative of a vat dyestufi and an organic with substantially the same result by 2-mcompound containing a'sulphonic acid groupand l0 su1phoethylthio-)-A -iminazoline (which may be an isothiourea or substituted isothiourea group.

The organic compounds used in my new dyestuff preparations have a solubilising or disparsing-action on the leuco sulphuric esters.

As a suitable organic compound for use in the invention there may be mentioned 2-benzyl-thio- A -irninazoline-m-su1phonic acid which may be prepared by heating m-sulphobenzyldimethylphenylammonium with ethylene thiourea in aqueous medium.

The leuco sulphuric ester derivative of a vat dyestufi used in the invention may be a derivative of a vat dyestuff of the anthraquinone,

prepared by heating sodium-Q-bromoethane sulphonate with ethylene thiourea in aqueous medium) or by N :N:N-trimethyl-S-m-sulphobenzylisothiourea (which may be prepared by heating m-sulphobenzyldimethylphenylammonium with. N:N:N-trimethylthiourea in aqueous medium) or by N:N-dimethyl-S-m-sulphobenzylisothiourea (which may be prepared by heating m-sulphobenzyldimethylphenylammonium with N:N-dimethylthiourea in aqueous medium).

Example 2 indigo or thioindigo series and it may be added 10 gg z i i ggfg g ggz ig z gi g g fi Z g to the dyestufi preparation in the form of a salt, of leucodibromanthanthr for example the sodium salt. 10 arts of urea and one The present invention is directed especially to 5 garts of p su1 hoeth 1thi0) A2 iminazo the use of those leuco sulphuric ester derivatives line are dissolved y which give sparingly soluble alkali metal or am- 7 parts of Water The solution is added to ggg gfii i g zfi fi g gl ggg ig gia 60 parts of starch tragacanth thickening previously neutralised with ammonia.

fabrics by the conventional methods. 2 parts of a 50% ammonium thiocyanate If required urea may also be added to the dye- Solution stuff preparation.

The new dyestuff preparatlons of my invention 2 g; 2 3 ig ii figg z sfizggg ggfiagg when made up into printing pastes by known are then addod methods give much brighter and stronger prints e than those obtainable from the sparingly soluble 100 arts leuco sulphuric derivative of the vat dyestufi in p the absence of the organic compound as herein- 40 T1 1e P e S O a e s p t d onto cotton before defined fabric. The fabric is then dried and the print is The invention is illustrated but not limited by fieveloped y Steaming during 10 minutes, rinsing the following examples in which the parts are In Wa r and oap t t e boil- A Ve y brig by eight level and strong orange print is obtained.

Ezvample 1 In the above example the 2-(fi-sulphoethyl- 10 parts of a dyestuff paste containing 25% or :Eg g fi t gjfi f fiig ag fi fggg ggg iisfif igg Sulphunc ester S-m-sulphobenzylisothiourea or by N:N'-dimeth 10 parts of urea and mgtclggs-m-sulphobenzylisothiourea.

5 a of p 1. Dyestufi preparations for use in the printing 12 3 9 2 23 12 2 is added to of textile materials comprising a leuco sulphuric parts of starch tragacanth thickening and g 5 gggggz g g g ggfig and smpho' 3 parts of a 30% sodium nitrite solution are then added. as

parts wherein R is a radical selected from the group consisting of sulphonated alkyl radicals and sulphonated monocyclic aromatic hydrocarbon radicals and X is a radical selected from the group consisting of R1, R2, and R3 being selected from the group consisting of hydrogen and alkyl radicals.

and

2. Dyestuff preparations for use in the printing of textile materials comprising a leuco sulphuric ester derivative of a vat dyestuff and 2-benzylthio- A -iminaz oline-m-sulphonic acid.

3. Dyestufi preparations for use inthe printing of textile materials comprising a leuco sulphuric ester derivative of a vat dyestuff and N:N-dimethyl-S-m-sulphobenzylisothiourea.

4. Dyestufi preparations for use in the printing of textile materials comprising a leuco sulphuric ester derivative of a vat dyestuff and N:N:N'-trimethyl-S-m-sulphobenzylisothiourea.

5. Dyestufi preparations for use in the printing of textile materials comprising a leuco sulphuric ester derivative of a vat dyestufi, urea, and a sulphonated isothiourea of the formula wherein R is a radical selected from the group consisting of sulphonated alkyl radicals and sulphonated monocyclic aromatic hydrocarbon radicals and X is a radical selected from the group consisting of NRaR;

and

N--cm N H- E:

the form of a sparingly soluble alkali metal salt.

8. Dyestufi preparations as claimed in claim 1 wherein said leuco sulphuric ester derivative i in the form of a sparingly soluble ammonium salt.

ARTHUR TOPHAM.

REFERENCES CITED The following references are of record in the file of this patent:

FOREIGN PATENTS Number Country Date 644,819 Great Britain Oct. 18, 1950 235,027 Switzerland Mar. 1, 1945 

1. DYESTUFF PREPARATIONS FOR USE IN THE PRINTING OF TEXTILE MATERIALS COMPRISING A LEUCO SULPHURIC ESTER DERIVATIVE OF A VAT DYESTUFF AND A SULPHONATED ISOTHIOUREA OF THE FORMULA 